blob: 3b8ba1de19367ef6fd0987a1152bdb7d711b2428 [file] [log] [blame]
// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <string>
#include <utility>
#include <vector>
#include "base/memory/scoped_ptr.h"
#include "base/memory/scoped_vector.h"
#include "base/memory/weak_ptr.h"
#include "base/observer_list.h"
#include "base/time/time.h"
#include "base/values.h"
#include "chrome/browser/prerender/prerender_final_status.h"
#include "chrome/browser/prerender/prerender_origin.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
#include "content/public/browser/web_contents_observer.h"
#include "content/public/common/referrer.h"
#include "ui/gfx/size.h"
class Profile;
namespace base {
class ProcessMetrics;
namespace content {
class RenderViewHost;
class SessionStorageNamespace;
class WebContents;
namespace history {
struct HistoryAddPageArgs;
namespace net {
class URLRequestContextGetter;
namespace prerender {
class PrerenderHandle;
class PrerenderManager;
class PrerenderResourceThrottle;
class PrerenderContents : public content::NotificationObserver,
public content::WebContentsObserver,
public base::SupportsWeakPtr<PrerenderContents> {
// PrerenderContents::Create uses the currently registered Factory to create
// the PrerenderContents. Factory is intended for testing.
class Factory {
Factory() {}
virtual ~Factory() {}
// Ownership is not transfered through this interface as prerender_manager,
// prerender_tracker, and profile are stored as weak pointers.
virtual PrerenderContents* CreatePrerenderContents(
PrerenderManager* prerender_manager,
Profile* profile,
const GURL& url,
const content::Referrer& referrer,
Origin origin,
uint8 experiment_id) = 0;
class Observer {
// Signals that the prerender has started running.
virtual void OnPrerenderStart(PrerenderContents* contents) = 0;
// Signals that the prerender has had its load event.
virtual void OnPrerenderStopLoading(PrerenderContents* contents);
// Signals that the prerender has had its 'DOMContentLoaded' event.
virtual void OnPrerenderDomContentLoaded(PrerenderContents* contents);
// Signals that the prerender has stopped running. A PrerenderContents with
// an unset final status will always call OnPrerenderStop before being
// destroyed.
virtual void OnPrerenderStop(PrerenderContents* contents) = 0;
// Signals that this prerender has just become a MatchComplete replacement.
virtual void OnPrerenderCreatedMatchCompleteReplacement(
PrerenderContents* contents, PrerenderContents* replacement);
virtual ~Observer() = 0;
// Indicates how this PrerenderContents relates to MatchComplete. This is to
// figure out which histograms to use to record the FinalStatus, Match (record
// all prerenders and control group prerenders) or MatchComplete (record
// running prerenders only in the way they would have been recorded in the
// control group).
enum MatchCompleteStatus {
// A regular prerender which will be recorded both in Match and
// MatchComplete.
// A prerender that used to be a regular prerender, but has since been
// replaced by a MatchComplete dummy. Therefore, we will record this only
// for Match, but not for MatchComplete.
// A prerender that is a MatchComplete dummy replacing a regular prerender.
// In the control group, our prerender never would have been canceled, so
// we record in MatchComplete but not Match.
// A prerender that is a MatchComplete dummy, early in the process of being
// created. This prerender should not fail. Record for MatchComplete, but
// not Match.
virtual ~PrerenderContents();
// All observers of a PrerenderContents are removed after the OnPrerenderStop
// event is sent, so there is no need to call RemoveObserver() in the normal
// use case.
void AddObserver(Observer* observer);
void RemoveObserver(Observer* observer);
// For MatchComplete correctness, create a dummy replacement prerender
// contents to stand in for this prerender contents that (which we are about
// to destroy).
PrerenderContents* CreateMatchCompleteReplacement();
bool Init();
static Factory* CreateFactory();
// Returns a PrerenderContents from the given web_contents, if it's used for
// prerendering. Otherwise returns NULL. Handles a NULL input for
// convenience.
static PrerenderContents* FromWebContents(content::WebContents* web_contents);
// Start rendering the contents in the prerendered state. If
// |is_control_group| is true, this will go through some of the mechanics of
// starting a prerender, without actually creating the RenderView.
// |creator_child_id| is the id of the child process that caused the prerender
// to be created, and is needed so that the prerendered URLs can be sent to it
// so render-initiated navigations will swap in the prerendered page. |size|
// indicates the rectangular dimensions that the prerendered page should be.
// |session_storage_namespace| indicates the namespace that the prerendered
// page should be part of.
virtual void StartPrerendering(
int creator_child_id,
const gfx::Size& size,
content::SessionStorageNamespace* session_storage_namespace,
net::URLRequestContextGetter* request_context);
// Verifies that the prerendering is not using too many resources, and kills
// it if not.
void DestroyWhenUsingTooManyResources();
content::RenderViewHost* GetRenderViewHostMutable();
const content::RenderViewHost* GetRenderViewHost() const;
PrerenderManager* prerender_manager() { return prerender_manager_; }
base::string16 title() const { return title_; }
int32 page_id() const { return page_id_; }
const GURL& prerender_url() const { return prerender_url_; }
const content::Referrer& referrer() const { return referrer_; }
bool has_stopped_loading() const { return has_stopped_loading_; }
bool has_finished_loading() const { return has_finished_loading_; }
bool prerendering_has_started() const { return prerendering_has_started_; }
MatchCompleteStatus match_complete_status() const {
return match_complete_status_;
void set_match_complete_status(MatchCompleteStatus status) {
match_complete_status_ = status;
// Sets the parameter to the value of the associated RenderViewHost's child id
// and returns a boolean indicating the validity of that id.
virtual bool GetChildId(int* child_id) const;
// Sets the parameter to the value of the associated RenderViewHost's route id
// and returns a boolean indicating the validity of that id.
virtual bool GetRouteId(int* route_id) const;
FinalStatus final_status() const { return final_status_; }
Origin origin() const { return origin_; }
uint8 experiment_id() const { return experiment_id_; }
int child_id() const { return child_id_; }
base::TimeTicks load_start_time() const { return load_start_time_; }
// Indicates whether this prerendered page can be used for the provided
// |url| and |session_storage_namespace|.
bool Matches(
const GURL& url,
const content::SessionStorageNamespace* session_storage_namespace) const;
// content::WebContentsObserver implementation.
virtual void RenderFrameCreated(
content::RenderFrameHost* render_frame_host) OVERRIDE;
virtual void DidStopLoading(
content::RenderViewHost* render_view_host) OVERRIDE;
virtual void DocumentLoadedInFrame(
int64 frame_id, content::RenderViewHost* render_view_host) OVERRIDE;
virtual void DidStartProvisionalLoadForFrame(
int64 frame_id,
int64 parent_frame_id,
bool is_main_frame,
const GURL& validated_url,
bool is_error_page,
bool is_iframe_srcdoc,
content::RenderViewHost* render_view_host) OVERRIDE;
virtual void DidCommitProvisionalLoadForFrame(
int64 frame_id,
const base::string16& frame_unique_name,
bool is_main_frame,
const GURL& url,
content::PageTransition transition_type,
content::RenderViewHost* render_view_host) OVERRIDE;
virtual void DidFinishLoad(
int64 frame_id,
const GURL& validated_url,
bool is_main_frame,
content::RenderViewHost* render_view_host) OVERRIDE;
virtual void DidNavigateMainFrame(
const content::LoadCommittedDetails& details,
const content::FrameNavigateParams& params) OVERRIDE;
virtual void DidGetRedirectForResourceRequest(
content::RenderViewHost* render_view_host,
const content::ResourceRedirectDetails& details) OVERRIDE;
virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
virtual void RenderProcessGone(base::TerminationStatus status) OVERRIDE;
// content::NotificationObserver
virtual void Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) OVERRIDE;
// Checks that a URL may be prerendered, for one of the many redirections. If
// the URL can not be prerendered - for example, it's an ftp URL - |this| will
// be destroyed and false is returned. Otherwise, true is returned.
virtual bool CheckURL(const GURL& url);
// Adds an alias URL. If the URL can not be prerendered, |this| will be
// destroyed and false is returned.
bool AddAliasURL(const GURL& url);
// The prerender WebContents (may be NULL).
content::WebContents* prerender_contents() const {
return prerender_contents_.get();
content::WebContents* ReleasePrerenderContents();
// Sets the final status, calls OnDestroy and adds |this| to the
// PrerenderManager's pending deletes list.
void Destroy(FinalStatus reason);
// Called by the history tab helper with the information that it woudl have
// added to the history service had this web contents not been used for
// prerendering.
void DidNavigate(const history::HistoryAddPageArgs& add_page_args);
// Applies all the URL history encountered during prerendering to the
// new tab.
void CommitHistory(content::WebContents* tab);
base::Value* GetAsValue() const;
// Returns whether a pending cross-site navigation is happening.
// This could happen with renderer-issued navigations, such as a
// MouseEvent being dispatched by a link to a website installed as an app.
bool IsCrossSiteNavigationPending() const;
// Marks prerender as used and releases any throttled resource requests.
void PrepareForUse();
content::SessionStorageNamespace* GetSessionStorageNamespace() const;
// Cookie events
enum CookieEvent {
// Record a cookie transaction for this prerender contents.
// In the event of cookies being sent, |earliest_create_date| contains
// the time that the earliest of the cookies sent was created.
void RecordCookieEvent(CookieEvent event,
bool is_main_frame_http_request,
bool is_third_party_cookie,
bool is_for_blocking_resource,
base::Time earliest_create_date);
static const int kNumCookieStatuses;
static const int kNumCookieSendTypes;
// Called when a PrerenderResourceThrottle defers a request. If the prerender
// is used it'll be resumed on the IO thread, otherwise they will get
// cancelled automatically if prerendering is cancelled.
void AddResourceThrottle(
const base::WeakPtr<PrerenderResourceThrottle>& throttle);
// Increments the number of bytes fetched over the network for this prerender.
void AddNetworkBytes(int64 bytes);
PrerenderContents(PrerenderManager* prerender_manager,
Profile* profile,
const GURL& url,
const content::Referrer& referrer,
Origin origin,
uint8 experiment_id);
// Set the final status for how the PrerenderContents was used. This
// should only be called once, and should be called before the prerender
// contents are destroyed.
void SetFinalStatus(FinalStatus final_status);
// These call out to methods on our Observers, using our observer_list_. Note
// that NotifyPrerenderStop() also clears the observer list.
void NotifyPrerenderStart();
void NotifyPrerenderStopLoading();
void NotifyPrerenderDomContentLoaded();
void NotifyPrerenderStop();
void NotifyPrerenderCreatedMatchCompleteReplacement(
PrerenderContents* replacement);
// Called whenever a RenderViewHost is created for prerendering. Only called
// once the RenderViewHost has a RenderView and RenderWidgetHostView.
virtual void OnRenderViewHostCreated(
content::RenderViewHost* new_render_view_host);
content::NotificationRegistrar& notification_registrar() {
return notification_registrar_;
bool prerendering_has_been_cancelled() const {
return prerendering_has_been_cancelled_;
content::WebContents* CreateWebContents(
content::SessionStorageNamespace* session_storage_namespace);
bool prerendering_has_started_;
// Time at which we started to load the URL. This is used to compute
// the time elapsed from initiating a prerender until the time the
// (potentially only partially) prerendered page is shown to the user.
base::TimeTicks load_start_time_;
// The prerendered WebContents; may be null.
scoped_ptr<content::WebContents> prerender_contents_;
// The session storage namespace id for use in matching. We must save it
// rather than get it from the RenderViewHost since in the control group
// we won't have a RenderViewHost.
int64 session_storage_namespace_id_;
// The time at which we started prerendering, for the purpose of comparing
// cookie creation times.
base::Time start_time_;
class WebContentsDelegateImpl;
// Needs to be able to call the constructor.
friend class PrerenderContentsFactoryImpl;
// Returns the ProcessMetrics for the render process, if it exists.
base::ProcessMetrics* MaybeGetProcessMetrics();
// Message handlers.
void OnCancelPrerenderForPrinting();
ObserverList<Observer> observer_list_;
// The prerender manager owning this object.
PrerenderManager* prerender_manager_;
// The URL being prerendered.
GURL prerender_url_;
// The referrer.
content::Referrer referrer_;
// The profile being used
Profile* profile_;
// Information about the title and URL of the page that this class as a
// RenderViewHostDelegate has received from the RenderView.
// Used to apply to the new RenderViewHost delegate that might eventually
// own the contained RenderViewHost when the prerendered page is shown
// in a WebContents.
base::string16 title_;
int32 page_id_;
GURL url_;
content::NotificationRegistrar notification_registrar_;
// A vector of URLs that this prerendered page matches against.
// This array can contain more than element as a result of redirects,
// such as HTTP redirects or javascript redirects.
std::vector<GURL> alias_urls_;
bool has_stopped_loading_;
// True when the main frame has finished loading.
bool has_finished_loading_;
// This must be the same value as the PrerenderTracker has recorded for
// |this|, when |this| has a RenderView.
FinalStatus final_status_;
// The MatchComplete status of the prerender, indicating how it relates
// to being a MatchComplete dummy (see definition of MatchCompleteStatus
// above).
MatchCompleteStatus match_complete_status_;
// Tracks whether or not prerendering has been cancelled by calling Destroy.
// Used solely to prevent double deletion.
bool prerendering_has_been_cancelled_;
// Process Metrics of the render process associated with the
// RenderViewHost for this object.
scoped_ptr<base::ProcessMetrics> process_metrics_;
scoped_ptr<WebContentsDelegateImpl> web_contents_delegate_;
// These are -1 before a RenderView is created.
int child_id_;
int route_id_;
// Origin for this prerender.
Origin origin_;
// Experiment during which this prerender is performed.
uint8 experiment_id_;
// The process that created the child id.
int creator_child_id_;
// Main frame ID of last committed page.
int64 main_frame_id_;
// The size of the WebView from the launching page.
gfx::Size size_;
typedef std::vector<history::HistoryAddPageArgs> AddPageVector;
// Caches pages to be added to the history.
AddPageVector add_page_vector_;
// The alias session storage namespace for this prerender.
// Indicates what internal cookie events (see have
// occurred, using 1 bit for each possible InternalCookieEvent.
int cookie_status_;
// Indicates whether existing cookies were sent for this prerender, and
// whether they were third-party cookies, and whether they were for blocking
// resources. See the enum CookieSendType in
int cookie_send_type_;
// Resources that are throttled, pending a prerender use. Can only access a
// throttle on the IO thread.
std::vector<base::WeakPtr<PrerenderResourceThrottle> > resource_throttles_;
// A running tally of the number of bytes this prerender has caused to be
// transferred over the network for resources. Updated with AddNetworkBytes.
int64 network_bytes_;
} // namespace prerender